When configuring three-level wave generation, CMPA and CMPB(complementary) configurations are used. It is found that the tube is always on (or off), there is an exception, and there is no corresponding complementary. Are there any analysis directions or suggestions?
See Figure 1 for specific configuration;
The actual measured waveform is shown in Figure 2;
Refer to figure 3 for normal waveform.
Figure 1 DSP configuration:
Figure 2 abnormal waveform,4 channel are CMPA,3 channel are CMPB.
When channel 4 is always high, channel 3 should always be low, but some pulses appear, and the pulse width is the dead band setting time.
Figure 3 normal waveform ,4 channel are CMPA,3 channel are CMPB.